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Note that this wiki now uses the CC BY-SA 4.0 International license. Material on wikis under the CC BY-SA 3.0 Unported license can still be used here, but must be imported under the terms of that license's upgrade allowance.

Wikipedia also has a fair amount of Doom coverage; see, for example, Category:Doom (series). Note that Wikipedia articles generally include extensive background information or wording that is irrelevant in this context.